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module/raid: register RAID modules

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Add the ability to register RAID modules. Supported RAID levels are
determined based on the list of registered modules.

The module descriptor structure will hold the function pointers for
RAID-level specific operations.

Signed-off-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
Change-Id: I7a579ac381f1764b427a48d1dc31260725217c4e
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/471080
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
This commit is contained in:
Artur Paszkiewicz 2019-10-09 11:22:41 +02:00 committed by Tomasz Zawadzki
parent 7c77c29268
commit 706029d5be
3 changed files with 61 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
module/bdev/raid/bdev_raid.c
View File

@ -66,6 +66,32 @@ struct raid_all_tailq g_raid_bdev_list = TAILQ_HEAD_INITIALIZER(g_raid_bdev_lis
struct raid_offline_tailq g_raid_bdev_offline_list = TAILQ_HEAD_INITIALIZER(
g_raid_bdev_offline_list);
static TAILQ_HEAD(, raid_bdev_module) g_raid_modules = TAILQ_HEAD_INITIALIZER(g_raid_modules);
static struct raid_bdev_module *raid_bdev_module_find(enum raid_level level)
{
struct raid_bdev_module *raid_module;
TAILQ_FOREACH(raid_module, &g_raid_modules, link) {
if (raid_module->level == level) {
return raid_module;
}
}
return NULL;
}
void raid_bdev_module_list_add(struct raid_bdev_module *raid_module)
{
if (raid_bdev_module_find(raid_module->level) != NULL) {
SPDK_ERRLOG("module for raid level '%s' already registered.\n",
raid_bdev_level_to_str(raid_module->level));
assert(false);
} else {
TAILQ_INSERT_TAIL(&g_raid_modules, raid_module, link);
}
}
/* Function declarations */
static void raid_bdev_examine(struct spdk_bdev *bdev);
static int raid_bdev_init(void);
@ -722,7 +748,7 @@ raid_bdev_config_find_by_name(const char *raid_name)
* raid_name - name for raid bdev.
* strip_size - strip size in KB
* num_base_bdevs - number of base bdevs.
* level - raid level, only raid level 0 is supported.
* level - raid level.
* _raid_cfg - Pointer to newly added configuration
*/
int
@ -748,12 +774,6 @@ raid_bdev_config_add(const char *raid_name, uint32_t strip_size, uint8_t num_bas
return -EINVAL;
}
if (level != RAID0) {
SPDK_ERRLOG("invalid raid level %u, only raid level 0 is supported\n",
level);
return -EINVAL;
}
raid_cfg = calloc(1, sizeof(*raid_cfg));
if (raid_cfg == NULL) {
SPDK_ERRLOG("unable to allocate memory\n");
@ -1220,11 +1240,10 @@ raid_bdev_create(struct raid_bdev_config *raid_cfg)
raid_bdev->config = raid_cfg;
raid_bdev->level = raid_cfg->level;
switch (raid_bdev->level) {
case RAID0:
break;
default:
SPDK_ERRLOG("invalid raid level %u\n", raid_bdev->level);
raid_bdev->module = raid_bdev_module_find(raid_bdev->level);
if (raid_bdev->module == NULL) {
SPDK_ERRLOG("Unsupported raid level '%d'\n", raid_bdev->level);
free(raid_bdev->base_bdev_info);
free(raid_bdev);
return -EINVAL;
}

25
module/bdev/raid/bdev_raid.h
View File

@ -153,6 +153,9 @@ struct raid_bdev {
/* Set to true if destroy of this raid bdev is started. */
bool destroy_started;
/* Module for RAID-level specific operations */
struct raid_bdev_module *module;
};
/*
@ -240,6 +243,28 @@ struct raid_bdev_config *raid_bdev_config_find_by_name(const char *raid_name);
enum raid_level raid_bdev_parse_raid_level(const char *str);
const char *raid_bdev_level_to_str(enum raid_level level);
/*
* RAID module descriptor
*/
struct raid_bdev_module {
/* RAID level implemented by this module */
enum raid_level level;
TAILQ_ENTRY(raid_bdev_module) link;
};
void raid_bdev_module_list_add(struct raid_bdev_module *raid_module);
#define __RAID_MODULE_REGISTER(line) __RAID_MODULE_REGISTER_(line)
#define __RAID_MODULE_REGISTER_(line) raid_module_register_##line
#define RAID_MODULE_REGISTER(_module) \
__attribute__((constructor)) static void \
__RAID_MODULE_REGISTER(__LINE__)(void) \
{ \
raid_bdev_module_list_add(_module); \
}
void
raid0_start_rw_request(struct spdk_io_channel *ch, struct spdk_bdev_io *bdev_io);
void

5
module/bdev/raid/raid0.c
View File

@ -358,4 +358,9 @@ raid0_submit_null_payload_request(void *_bdev_io)
}
}
static struct raid_bdev_module g_raid0_module = {
.level = RAID0,
};
RAID_MODULE_REGISTER(&g_raid0_module)
SPDK_LOG_REGISTER_COMPONENT("bdev_raid0", SPDK_LOG_BDEV_RAID0)